e1_input: minor API changes to adapt it to openbsc

While working on the openbsc over libosmo-abis port, I noticed
several API changes that we need to perform for better adaptation.
diff --git a/src/input/misdn.c b/src/input/misdn.c
index 3ccfc4d..cf8b5d9 100644
--- a/src/input/misdn.c
+++ b/src/input/misdn.c
@@ -109,8 +109,8 @@
 	}
 
 	if (alen != sizeof(l2addr)) {
-		if (line->ops.error)
-			line->ops.error(NULL, -EBADMSG);
+		if (line->ops->error)
+			line->ops->error(NULL, line, ts_nr, -EBADMSG);
 		return -EINVAL;
 	}
 
@@ -173,8 +173,8 @@
 		l2addr.channel, l2addr.sapi, l2addr.tei);
 		break;
 	default:
-		if (line->ops.error)
-			line->ops.error(NULL, -EBADMSG);
+		if (line->ops->error)
+			line->ops->error(NULL, line, ts_nr, -EBADMSG);
 		break;
 	}
 	return ret;